20550312 has 24 divisors (see below), whose sum is σ = 55657290. Its totient is φ = 6850080.

The previous prime is 20550301. The next prime is 20550319. The reversal of 20550312 is 21305502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 1313316 = 4386^2 + 1146^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20550319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142639 + ... + 142782.

Almost surely, 2^20550312 is an apocalyptic number.

It is an amenable number.

20550312 is an abundant number, since it is smaller than the sum of its proper divisors (35106978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20550312 is a wasteful number, since it uses less digits than its factorization.

20550312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285433 (or 285426 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 20550312 is about 4533.2451952216. The cubic root of 20550312 is about 273.9088975547.

Adding to 20550312 its reverse (21305502), we get a palindrome (41855814).

The spelling of 20550312 in words is "twenty million, five hundred fifty thousand, three hundred twelve".